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Prefix-Codes

typeface

Serif is decoration at end of letter strokes

Times, Courier and Arial

family of graphic , sizes & styles

Human perception

Less sensitive to some information

Redundancy

Recognize repeating patterns

Variable length encoding

Dictionary

Working with Text

other ways to communicate

Drop down boxes

Pop-up Message

Hyperlinking

Convert non-standard fonts to graphics

Keep lines short

Avoid scrolling text

Use space between lines

Use different colours and backgrounds

Avoid decorative (serif) fonts for small sizes

Compression

Compression ratio = B0%B1

Lossy

Lossy Methods

MP3

MPEG

JPEG

Video and audio compression

Exploits redundancy & human perception

does not allow recovery

Lossless

Lossless Methods

LempelZiv

Huff-man

Creating the Binary tree

2.Repeat until the list has only one symbol left

1.Initialization

Use binary tree to encode compressed file

Size of encoding = length of path

output path from root to leaf

Run length

WWWWWBWWWWBBBWWWWWWBWWW

5W1B4W3B6W1B3W

one of the simplest forms of data compression.

Allows complete recovery

bit-preserving or reversible compression systems

Applied to general data

Exploits Redundancy in data

The process of coding that will effectively reduce the total number of bits